package com.itheima.reggie.controller;

import com.itheima.reggie.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 功能：文件上传和下载
 * 作者：zhoujun
 * 日期： 2025/1/8 0:00
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String bashPath;
    /**
     * 上传文件
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public Result<String> upload(MultipartFile file) {
        // file只是一个临时文件，需要转存到指定位置，否则请求完成后会自动删除
        log.info(file.toString());
        
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        String fileName = UUID.randomUUID().toString() + suffix;

        File dir = new File(bashPath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(bashPath + originalFilename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return Result.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        // 输入流，通过输入流读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(bashPath + name));
            //输出流，通过输出流将文件写回浏览器，在浏览器展示图片了

                ServletOutputStream outputStream = response.getOutputStream();


            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }


    }
}